Re: Engine Trouble...
Wondering: Did your original purchase come from the Ebay seller with the name starting Clew-something? And since they are no longer on eBay is it this outfit?: Shaw City Engines?
Something to consider Brian-if this is your daily driver and you are fixed for time: Get your hands on a proven local rebuild that will suffix for the time being and get you to work dependably. Pop your old motor out and pop the direct running replacement in "the same day". Rebuilding your old motor will takes weeks if not months to accomplish. You may even want to ditch many of the parts on it that you have questions about altogether. The key here is "get you going-now". See if you can buy from a local supplier or reputable builder such as the ones here on TC.
1970-LS5, #28- Fathom Blue,TH400, original motor car.
1970- NOM, 496, M21, #48 Forest Green.
1972- Malibu, 350. TH350- original motor car, #43 Gulf Green.
1970 Chevelle 517 cid, TH400, best ET mid 9's. #19.