The drawback for me has always been the lack of finding all the parts in one place for a turn-key engine. Gaskets, sparkplug boots, distributor, waterpumps, motorplates, timing chains, camshafts, etc, etc. I still see folks asking for individual parts all along to complete a particular engine. If, and that is a big IF all the parts were available, then I would be much more likely to consider the deal as feasible. Most folks will find the money for anything they feel is worth the risk, and it is risky to start collecting parts for a SOHC when you don't know if you will be able to find ALL the parts to get the engine completed. That is a lot of money to commit to without knowing if you can get all the parts available in one place to make it work. In the end, if you were to sell 50 engines, what would be the profit margin? Sounds risky at best, but that is your decision to make. Joe-JDC