360 Advice Needed - Autocross / Street Engine Build

With the 3.91 gears, you are already going to be able spin tires at will in 1st. At what point up the curve they will spin in 2nd is perhaps more of the question. But that is what your brain and right foot are for... to manage that. Having the torque and managing it is better than not having the torque. Try rallying someday... in loose gravel, mud, snow, ice..... a stock Hyundai 1.8L in 4th gear will spin the tires LOL

BTW, who would pull (grind) the material out of the heads? 2 cc's is not all that hard. But finding 5-6 cc's of material and not going into the worn area gets harder; it was quite worry to me when I ground out 6-8 cc's from some iron chambers a long time ago. If the bottom end is all together, then I can see not wanting to touch the pistons.

And as for the quench gap.....there will be piston and bore wear and the pistons will rock more and more over the long term. So if you want to keep this engine for a long period of time, then keep that in mind as you think about piston-to-head clearance; .030" is the minimum that the local racers around here use but that is for engines that get torn down and refreshed regularly. More is wise/necessary for long term use.