go for it, 355 cube v8's are what all the the popular supplier rate their pill settings on, smaller engines get a harder hit, larger ones a softer hit. as for the engine, even if its a cast piston unbalanced stocker u can add as much as 175bhp safly given a good adjustable fuel pressure system and automatically retarding ignition system u can actually run as much as 200bhp hits so long as u do not make it all 1 hit, stage it with say 75bhp n 1* of retard, the add on the remaining 125bhp with an additional 3* retard, maintain a min of 6psi FP with all stages activated and WOT with a carb, min of normal plus 1 PSI FP at WOT and full activation with an MFI or EFI systems....enjoy....
a good investment toward consistancy would b a bottle warmer for those cooler days n night to maintain a consistant bottle pressure which makes for consistancy in ur passes from 1st to last pass per fill.
(system work best when bottle presure is consistantly at or near 1200 PSI)