This is just my 2 cents Ed, if I were in you're shoes knowing what I know now about classic cars, I would put the original engine up somewhere safe and get a later model roller. Not for just that reason tho there are several improvements that I like, things like a better style rear oil seal. Like I say tho that is just me but my thoughts are if I build HP with the original block I would drive it like a bandit and blow a rod out the side and it would be lost forever.