Hi. I'm back after a several year absence. Some background.....I have a chopped, twice "Z-ed" and slammed '40 Chevy 2 door sedan. Tilted B pillars and back glass. Power is provided by a 496" BBC. It has (8 stack) Hilborn electronic fuel injection that works extremely well. Comp Cams roller cam, Scat crank, Eagle rods, and Edelbrock aluminum heads. It's been dynoed at 450 to 500 HP at the rear wheels. I'm running a beefed up 700R4 with a Ford 9" rear end, 3:70 posi and Curry axles. The engine and trans work pretty much flawlessly. It's a really awesome looking and running show car that's also a driver.

OK, let's narrow this down a little.....in my shop I noticed a VERY slow leak in the area of the rear main seal. Soooooooo, if it is a main seal am I looking at a major procedure? If so, should I consider a rebuild or a replacement? There are currently so many really nice, very powerful, pump gas, crate engines being offered. So, assuming the car needs a rebuild or replacement which way would you lean? Rebuild or replace?

BTW, my mechanical knowledge runs pretty shallow and is very basic but I have a lot of knowledgeable buddies. If I replace the engine I would want to keep the Hilborn electronic fuel injection if at all possible and install it on the new engine.

So, rebuild or replace? What would be your choice be and why?