Best way to get better mileage would be to add a 4 barrel, intake, headers, and HEI. Also adding an OD trans would helps things Alot. You can turbo charge a stock 292 to as much as 10 pounds. Guy did it and loves it. 10 pounds will put you at something like almost 350+ hp....rough estimate cause I'm not sure on how much hp per pound of boost. My thoughts....Purchase a set of turbo pistons from Tom Lowe at 12bolt.com and a turbo cam. Have some head work done...Lump port..1.94 intake and 1.60 exhaust valves installed. Then a stock rebuild and balance from there. The stock piston is capable of boost, but is cast and heavy. Better to find forged pistons that are lighter. Check out Tom Lowe's sight and videos on youtube...he has a turbo charged and fuel injected 292 in his el camino. Thing moves! He's apart of this sight as well..TLowe is his user name I believe. I just did a 292 as well. You can see it in other threads I've posted. It'll be making around 300 hp and 330 torque naturally aspirated with boost still an option. TJ

Last edited by TJ's Chevy; 01/29/15 03:32 PM.

1966 C10 292/tko600 http://67-72chevytrucks.com/vboard/showthread.php?t=596643
1964 C20 292/sm420