225 slant 6 or 360 v8

Forget about the slanty
Power is addictive. The slanty will never be enough. Going from 140 to 200 to 230 to 250, is taking forever and costing way too much. Better to install 250 right at the start; and that takes a V8. Now you have potential to go 300 to 400 relatively cheap. And a lot of guys are happy in the mid to high 300s with 3500 pound cars. By 400 to 450 there's not much point in building more.Except for bragging rights.
But I gotta ask; why do you want to go 14s ?
A slanty can perform pretty good in first gear if you give it what it needs;namely gears and a higher stall. It won't go 14s or 15s or maybe not even 16s, but first gear can still be a ton of fun.
Ima thinking 3.91s and 2800 to start. Yes you will need a SureGrip. 3.23s are not nearly enough for a slanty, unless you have a 2.74 lowgear in that 904, then 3.55s will get you a good start.
If you need the car for hi-way useage, for sure ditch the slanty, build a hi-torque 360 and then the 3.23s may work. With good heads the 360 can sneak you into the13s easy. Maybe even into the twelves..... Mine went there with a [email protected] and 3.55s(stick-car).
So again, why 14s?