Building a 273

Quick is torque, Fast is rpm. Sounds like Babyblue66 wants quick. 3,000 rpm is where most good 273's and 340's come into their power band.
I find funny when people compare smaller and larger but with the smaller engine severely under geared.


Here's just a general statement to whom it may concern :)
And not against the OP's build.

Since 3.23-3.55 seem like the go to performance gear which is generally a compromise gear for most cars eg. 3.55 @ 100 mph with 28" tires = 4260 rpm maybe 4500 rpm with torque converter slippage a 3.23 would be about 400 rpms lower. 4500 rpm is well below most performance engines peak hp rpm especially smaller the engine, making good power. A peak hp at 4500 rpm would be about .08-.09 per cid would be a good hp goal if you wanted 3.55 be optimal. A good converter can help alleviate especially the closer peak power is to peak gearing rpm.

Part of the problem is what's optimal gearing for best acceleration, for the track is easy to calculate but for a street only car there's no goal post maybe best zero - 60 mph or 80-100 mph maybe more to me gearing for a 100 mph is a good number to gear for max street acceleration obviously building cars come with comprises but it good to figure out how compromise your choose is and maybe instead run a compromised gear could compromise engine choice or hp goal etc.. Or a bit of each for a less overall compromised situation.