I bought one of the engines that they tested. One of the best Ebay buys I have made. Complete engine (7250 miles) with all electronics, except ECM. Now lives in my 1982 FWD Revcon.
Go buy a Scan Gage, plug it in and read the code or codes. Look up ECM codes for what ever classic, (GM&Ford), that you have. You can also read MPG etc. going down the road along with resetting codes as you go.