I am just finishing a 409 stroker motor 62 Impala SS Hardtop so could provide info on how I did the project. Phil Reed helped with the motor. I used a 65 truck block purchased from Phil.
I have two 409 blocks one is truck that I had checked out will need to be bored to 80 and the other is 1962 with one sleeve and is standard but have not had the 62 checked yet not sure which one to use