Even though you could do that, The G.M. 6.2/6.5 engines were turds from the begining. I worked on them for 7 years installed in Hummers in the Army. These things are almost as bad as the Olds 260 and 350 diesel motors. (yuk)
I would say go with a small block or big block set up. Parts are readily available in the wrecking yards, and you wouldn't need to do much, if any, fab work. I think you could even use the same motor mounts. (not positive though)
In my opinion, I would stick to a small block. Go out and price the 454, then look at the parts, then go look at a 383 stroker motor. Same power, lighter weight, less cash. Small blocks win hands down IMO.
One thing to remember though, your tranny(TH 400, right?) is set up to shift at a rather low RPM, and if you slipped a gas motor in front of it with out addressing this issue, you'll be VERY disapointed in the performance you'll get. Either replace the tranny, or take it to someone who knows what to swap out in it.
[This message has been edited by longhornmail (edited 09-02-2001).]
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