347 power estimates

I've always enjoyed the posts listing the engine builds along with comments , suggestions and power estimates. I thought I would throw mine into the hopper to see what everybody thought.

65 mustang convertible
347- Eagle crankshaft-3.400 stroke
4.040 bore
JE pistons
Holley 750 vac. adv.
Bennett custom cam- hydraulic roller-Harland sharp roller rockers-1.6 ratio
lift- .536 intake .544 exhaust
duration@.050-224 intake 230 exhaust
Edelbrock performer heads
heads opened for larger valves-1.60 / 2.02
performance 3 angle seats, backcut valves
performer rpm intake
3/8'' fuel line-Carter high volume fuel pump 8psi
melling high volume oil pump-120gph
MSD distributor
C-4 trans with 2600 stall
3.25 8'' rear with traction lock
The headers and exhaust are from the original 289 and would like to upgrade. Standard tri-ys with 2 1/4" meineke exhaust
along with Dynomax turbo mufflers. It's a little tight underneath because it's a convertible so I'm not sure how big I can go with a mandrel exhaust. I've been looking at JBA tri ys along with Doug's, Accufab and Ford Powertrain however I am certainly open and would appreciate any suggestions. By the way, it's mainly for the street.

if its around 10:1 with no porting probably in the 400hp range +/-
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Thanks dfree383. The heads were ported and the intake was massaged somewhat. Compression is more like 9.5:1
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Looks like between 350 and 400 HP. I wasn't sure of a couple values (electric fuel pump, lobe seperation, spacer height).

347Vert, I got 415hp/440 tq from a 347 with a 224/224 @ .50 and a .532/.532 lift. My cast iron heads are ported at 225/185cfm. I believe the Performer RPM heads flow at 215/171cfm. Your cam is a little bigger than mine so you should be right around the same power range.
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fuel pump is mechanical and the lobe separation is 110.0. My exhaust system is restrictive so I'm sure there is a loss of power there. Problem is finding a mandrel system that will fit under the convertible. Anybody know of any custom exhaust shops in northern New Jersey.
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