That's why I left the oem cams in there. Then toss in the twin 62mm, blower, 94 octane, LT's, DSS-DS, watts link, and tru-trac = plenty of low end tq. 2nd gear on the automatic is 14% lower than 2nd gear in the manual. 3rd gear in the auto is 16.5% lower than 3rd gear in the manual. That's why I left the oem 3.31 rear gear alone. You would require a 3.73 in the manual to achieve the same overall ratio in 2nd gear. You would require a 3.90 rear gear to get the same overall ratio in the manual..in 3rd gear.
Manually shifted into 3rd gear at a red light, idling at 600 rpm, ( and oem 1.5 krpm stall converter).... mash the gas, shriek of rubber, and u go up to aprx 145 kph..all in 3rd. It's effortless really. That was just a test to see how it would pull from a red light, in 3rd gear, at idle. In 2nd gear, it will throw u into the back seat...up to 100 kph.
I looked long and hard at cams, for both a NA streetcar...and also a blower street car, and came to the conclusion for a street car, there was no, or limited benefit.