Ever consider a Goodwrench crate engine???
The complete long block is about $1300
I have a Goodwrench 350 in my 69.
I started off with a stock Goodwrench 350 then after about 20,000 miles I replaced the cam with a CompCams 275 DEH cam kit (lifters and cam.
Last year CHEVY HIGH PERFORMANCE did a series of modifications to a Basically stock Goodwrech 350, they built it up in stages.
Well lets cut to the chase, they got 408 horses. The key was the VORTEC heads
I have about 60,000 miles on the engine and have never had any problems... I see 6500 RPM all the time and It never skips a beat.
Here is a Cost breakdown
$1300 Goodwrench engine
$ 250 Camshaft and lifters
$ 80 Matching Valve springs
$ 400 Vortec Heads
$ 150 Edelbrock intake (vortec heads)
$ 65 Felpro steel shim Head Gaskets (.015)
$ 100 Centerbolt valve covers
$ 100 (estimated) miscelleaneous parts
or it may be cheaper to by the engine with the vortec heads already on it I think it is $2300, but it makes 330 horses which isn't what you wanted.
any other questions let me know
1969 Camaro RS/SS
350 Goodwrench Vortec Heads
E.T. [email protected]