welllllll...... i think the budget would be the determining factor here. could throw some alum heads on the rat and be back to about the weight of an iron sbc, LSx would be the "lightest" version with the pricetag being close to the sb2.2 PARTS(my USED sb2.2 heads assembled/intake/rockers/cam cost $3800 to the door) but you still need the rest of the combo(shortblock).
anything other than the bbc is gonna mean new headers, mounts for the LSx, bellhousing for the LSx(?) induction/electronics for the LSx....etc
so really its up to how much you wanna spend, how much labor you wanna go through to accomplish your new goals, and is the end result worth all the headaches.
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