well my stepdad and me rebuilt this engine twice and the first time we did it we use what he said was 13:1 keithblack high dome pistons and that was the gas we used. then we rebuilt it again cause we got bored and he said that i couldnt supercharge it with the high domes or that much compression so we put the flattops that were in it in the first place and we just never stopped with that. the car seemed to run alot better on it so that is what i used. but one day just a little while back i took it onto the road and punched it and it lifted off the ground and the unibody twisted and broke my windshield. so i took the motor out of the car and put it on the engine stands and im looking to build it more there and then find a car or s-10 in the near future.