so, i have a l36 that is in great condition but is also in a project car. I also have a l67 that is in a gtp, the motor in the gtp may be shot (still have to do a teardown) If i drop a "topswap" motor into the gtp my main concerns should be a good DP, maybe some nice porting, and a tune correct?

my other option is a bare block with a bad crank but good rods/pistons. I have been told a bottom end rebuild on these motors is not worth the trouble/money and may cause massive issues but i have access to a great machineshop guy and wouldnt mind having a "new" lower end. so what all would have to be done to the bare block\crank\rods to make them reliable.