3.5 if memory serves. The 400 has the shortest stroke of all sbc. With a crank change I think you can use 350 rods but verify-it's been a while. Get a catalog from P.A.W. in Ca. They have more engine stuff than anyone else & tons of kits.
yes
Yes.
yes but it has to be 83 or newer
No. The 400 is externally balanced and requires it's own flywheel.
No. Standard 350 engines have 4.00" pistons, standard 400 pistons are 4.125".
It should work well.
.030
its about 350
The main journals need to be turned down.
The "Vortec" engine is almost the same as an old school SBC, all things being such, the push rods are a little different for the OEM roller cams.
SBC Long Distance was created in 1996.
377