What fuel?
 

I have a 482cuin BBC 13-1 iron heads,720 solid roller.What octane fuel would be best?I was thinking 112?

110 will be fine

fuel
 

What Hammertime said.

fuel octane
 

what octane rating are you using? motor, research, or average of both? the sunoco 110 is 106 motor. vpc12 is 108 motor or 112 average rating. the 110 average is minimum. what rpm? stay under 7000, no NOS. heavy car? or over 7000rpm its safer to go with a better fuel. Main question to ask is how much did you spend on the engine? wanna blow it up being cheap? if money is an issue, dont race. poor fuel will eat rings and bearings. most guys blow an engine up never really understanding why.

I don't know what fuel they used in this car.I got it turn key and they didn't say.Its an 80 Malibu,stock suspension,(heavy car),Launch at 4100-4500,shift around 6800,no nitrous.

all u need is 108 octane which is good for cr up to 14..1 and rpm up to 7500.......with your combo i would say 106 to 108 octane