Hello I recently purchased a 76 Custom Deluxe 10 for my son and it just isn't exactly my area of expertise. Just a few points I could use some opinions in. First off it has a newer 350 in it. I believe 5.7 from about 1985 or so. It has also been routed for a serpentine belt. It has edlebrock intake and valve covers. I bought it from an old timer neighbor who worked on it only as project it just sat on a farm for better of 10 years. Here are its problems #1 leaking oil from rear of engine I believe it is all over the bottom of oilpan and transmission. Rear main seal would be my guess. I would really appreciate confirmation and importance of repair also the difficulty of changing it. Leaks about a quart or more per week. Problem #2 It runs hot on temperature gage while on the highway needle is about 4/4 (all the way) up yet no visual signs of overheating. Otherwise in the city it runs about 3/4 of the way up on gage. We have flushed the radiator, changed thurmostat and the overflow tank. Please let me know everything I can do to get this engine up to top condition. Thanks very much. MIKE.