For an "Iron Duke 101"
Go to:
http://en.wikipedia.org/wiki/GM_Iron_Duke_engine
It was made from 1977 to 1993! Went in to MANY vehicles ranging from the Pontiac Fiero, to Post Office delevery trucks! Has small block bell housing bolt pattern, so it should take the 5 speed gearbox, Or a T-56 6 speed transmission
This same engine apperentlly can mate up to ether transverse (FWD) or RWD transmissions. Differnt Transmissions!! Same engine.
I'm sure you can scoop up an old FWD celebrity or buick, that nobody wants, and just pluck the engine out. For cheep, like Vettowner.
Perhaps you could use a thinner gasket to bost compression. Also High power ignition should help. You can custom burn FE chips for the TBI, if equipped.
The 4.3 liter in the caprice was only 130 hp. they useed to have the shoertbaxe rfoer