Swapping 4.3 V6

[b1v3r]

I have an 85 CK that has a great body and nice running 4.3. V6. It only has about 68,/70,000 miles original miles on it because the previous owner died and it sat dorment for 2 years. I am fearful of the engine because of the age, (but it runs great). Would it be better to have the v6 rebuilt or go ahead and swap out for a rebuilt 305. Im not into speed, but I am into original and semi-custom. I was told that a 305 would bolt right up to thr recently rebuilt tranny and all I would need would be a/c brackets. It doesnt have ac now. I live on a very limited budget.