Nothing vrong in bolt on/off upgrades after my opinion as long as it is bolt on/off when converting it back to original. What is the actual problem with you L28, except of the cam, is the block / head cracked, have you drained the oil? if so poor it up in a clear jug, that will give you an idea of how much water there is in the oil when it seperate. When you put that motor in storage, did it then have anti freze to protect against corrosion, or were it w/o water and dry. I'm not saying don't go V8, but it doesn't have to be that expensive to get that L28 up running. Chris