Hi all - I have been dealing with this motor for 2 weeks now.. had it together - 125psi cold on all 8.. had some apparent spark trouble (had 6 in a bag that sat for a few years but still brand new plugs) - has an unknown variant of holley 2 barrel (list-7018-2, doesnt come up anywhere on holleys site). Cleaned carb out again - new power valve (2.5 0 i know it shd be a 7 probably since its a stock motor with no acc's).. Blows huge puffs of black smoke out the back - current timing is 1-5-4-2-6-3-7-8, its a 1974 ford 302. Just put in new bearings and rings - everything checked out, it must have been re-machined because all journal clearances are perfect. Having said that - im starting to get a little superstitious about this darn motor. thoughts?