First off,a 292 will be bad on gas,more hassle to install etc etc etc,,besides,, you already have a 250. \:\)

Install cast 307 .030 SBC flat top pistons w/4 valve reliefs,& I do mean flat tops, no chamfer,no dish,other than the valve reliefs.

Offy intake,w/a 4 bbl carb, or 2 bbl depends on how much power you want.

Zero deck the block,yes,just do it :-) It will payoff,w/no detonation.

Camshaft .480-.500 lift , duration @ .050- 210-220 or there abouts w/a 112 lobe center. With a OD trans you can get up to 25 MPG

My combo where I got 21 MPG was a hyd cam ,specs of .520 lift 230 degress duration 10.5 to 1 compression,5 speed manual.90 OD IIRC,Carter AFB 400 CFM 4 BBL.headers,& 2.5" single exhaust.410 gears,in a 3400 LB Camaro,no driver.Ran low 14's @ 3000ft altitude track.

Landon cast iron headers http://www.stoveboltengineco.com/acartpro/
split 2" exhaust or "Y" pipe into single 2.1/4" - 2.1/2" Depends on what sound you like.

I would also install Larrys lumps AKA Twisted6
http://cgi.ebay.com/ebaymotors/194-230-2...sQ5fAccessories
If you are not going to rev it past 5000 RPM,a stock damper is OK,not the best but,if you don't race it or rev it much,it will work.

There is more things but that should keep you busy.

MBHD

12 port SDS EFI