The gasket on top is the one that came with my 350 HO and the one on the bottom is the one that came with the gasket kit from Autozone. Where can I find another gasket like the one on top?

http://www.geocities.com/mwalte41990/Timing_cover_gasket.JPG

Jegs, or Summit. If you were doing a complete rebuild, most gasket kits would have come with both.

Dealer would be good place, you would have to buy the gasket kit for the pan.

Suggestion: don't glob the RTV on the new gasket as shown. It can break off and plug the oil pickup.

74-earlier used the thin front seal. 75-79 used the thicker one. 80-later switched the dipstick tube side and then went to 1-piece rear main.

Most of the aftermarket pans use the thicker seal also, even when used on an early engine. So if you're in a major bind and can't find it separately, order a pan gasket for 75-79 Chevy 350.

Jody

Might dig an unused one up at a local mechanic or machine shop.