1964 Standard 389 4bbl had 325 horsepower. Optional 389 Tri-power had 348 Horsepower
Weight on my Pontiac LeMans Sport registration is 3800
1964 pontiac 389
6
Info at this site might be helpful. http://www.justanswer.com/questions/2zzo6-timing-a-1966-pontiac-gto-389-with-tri-power-what-is-the-best
1000
A direct bolt in, 1961 to 1965 389 ci, Pontiac including the Pontiac Tempest.
Around 3000 lbs
Around 4000 lbs
Absolutely not!! The cylinder walls won't take that much over bore before you're in to the water jackets.
Around 3200-3300 lbs
It is cast right on the manifold if it is a factory manifold. 1,8,4,3,6,5,7,2