Mine had a 302 at first also. Seems like the normal path of evolution: 289, 302, 351C, 460, 514, 557, 600+,...etc.
A 393C is a 3.85 stroke Scat crank with a 5.995 (or 6.0) rod and a custom piston in a .030 overbore. One source is here:
http://www.flatlanderracing.com/
The 3V head is an aluminium 351C head from our friends in the Outback (not the eatery).
http://www.pavtek.com.au/pp_3vheads.html
I run Tubular headers which fit good, but I did take a one inch piece out of #3 tube to give additional firewall clearance.
Nice setup you've got. Sounds like a real runner too!
On the pulley item, I run regular 6 rib serpentine pulleys from a late 80's Mustang - just WP and crank, and an "large" (like 2.18"[img]/phpBB/images/smiles/icon_wink.gif[/img] alternator pulley and alternator likely from an Aerostar. (not sure - just found what I wanted in the alternator pile at the yard). The belt requires re-tighening a few times because the WP pully has no grooves, but it'll stick for normal (like we do that) driving. The only mod was to re-drill the WP pulley bolt holes to the C pattern. I run an 18" engine fan, but will switch to an electric when I go to an aluminium radiator.
400's - jrk, FWIW, these are just big 351C's. It only weights 25~50 lbs more than the C. I have a 400 short block in the garage and have considered the swap. Your problems will be in shock tower interference, intake sealing and the trans. The 400 moves everything about 7/8" up and out from a 351C location. I can't relate that for you to a 302, but it's much bigger - 2" or more. I run Tubular Automotive headers and the 400 would put them close against the floor boards. This gives more clearance from the draglink and idler arm, but can set your carpet on fire if the headers are not coated and you don't make a heat shield. There would be some trimming on the frametail-to-trans mount on the pass. side, even with 2V 1 3/4" pipes. You would have a nicer time with the plugs and headers by cutting an inch or so our of each shock tower and re-bracing. Weiand sells intake adapters to adapt 351C intakes to a 400. The problem is that this creates 4 sealing surfaces to deal with. I think motor mounts are unique to the 400, but you can use (I think I remember this right) Elite mounts, which have ears like the bottom of the 302 mounts. They are a bit wider apart, so you would need to fab a small spacer but they should set down very close to your V8 frame brackets. A better method would be to lotate where the ears meet the stock frame mounts and weld in a steel tube to handle the thru-bolt. You will also need a big block to C4 adapter bellhousing or switch to a C6 trans. I'd go to some wrecking yards and see if you can find a 351M/400 block in the scrap pile to use for dummying things up.
This is why a 393 stroker sounds so much better to me - more cubes in the same (existing) package.
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