Well, a 3.4" (347) stroke with a 4.125" bore (available from Dart) comes out to 363.5 ci... and you've still got the 8.2" deck height, so your existing oil pan, intake, etc will still work.

Using a 3.25" (331) stroke with the big bore comes out to 347ci.

With the Dart block, you would also be able to ramp up the bottle if you felt the 'need'. LOL!

Good Luck!

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66 mustang
302 4-speed 289 heads, 10.63 @ 129.3
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