Yeah, dual 600's might just be too much depending. You say smallblock, with no specs to speak of. That could be a 273 for all we know, or a 408. Or a 350.

Cam, gears, tire specs will all help, converter stall, trans type, etc. More you tell us more help you might get. Progressive or straight linkage?

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.