455 cubes out of a 336 can be done with good results. I have about 2600 miles on it so far and it is awesome. No overheating , not too much compression, no issues at all really. The only surprise was I had to run the exhaust manifolds with the dump to the front because of no starter clearance. For a recap - I used a '59 389 block, '60 timing cover, '71 heads, '66 tri power, '59 5 speed OD trans. All bolt together stuff. On May 2nd I'm going to put it on a Dyno. Not going to spin it very hard, maybe 4,200-4,800 since I won't have that many miles on it and I'm more interested in the torque numbers than HP.
http://1drv.ms/1HiK6HjGreg
