There at 7-11 to the right of the Slurpee machine. If they are sold out, go to an auto parts store and get a CAST IRON one, try a 1968 Chevelle with a small block, for the chimp to punch into his brain box of knowledge.
This one is the cheapest and will fit your sbc just fine. http://www.summitracing.com/parts/BSP-90120/
S-10 sounds about right. I always get a 4.3 liter one for SBC, they seem to hold up better. Go cast Iron, My buddy went through 2 aluminum/pot metal ones on his inline.
I'm on my second cheapo Mr. Gasket with the O-ring and no matter what I do it won't stop leaking. I gotta get an OEM one, thanks for pointing me in the right direction.
a painted cast iron one will last a long time......I got about 7 yrs out of a chrome potmetal autozone cheapy...it always leaked btw.
Around 1987 or 1988 vans have them I have one That im using on my build All I can remember about the van is it was a 305 with throttle body injection ,Im using the motor for a mockup mptor in my 29 .....And also it had serpentine belts