OK, I have a 307 with a mild cam, (204,214 degrees), 305 heads, Edelbrock performer intake, and a Quadra-Jet. I know the 307 was 200 hp stock with a 2-barrel, but I dont know how much more hp I'll now have. I've been told it will be quick, but I'm wondering about how much hp do you think It'll produce? Thanks guys.

 

An LG4 is "quick" compared to a '77 VW Rabbit diesel.

You aren't going to see a lot of improvement without improving the exhaust system. You also didn't say what air cleaner you have - LG4 is terrible (but better than the 307), L69 is a good piece. The 305 heads, depending upon exactly what they are, may be slightly better than the 307 2-bbl heads, but more details needed on exactly what you have.

BTW, that 200 hp for the 307 was gross, the 145 of the LG4 is net. The stock 305 LG4 is probably putting out more ponies than the 307, the L69 certainly is.

Your biggest gains are coming from the cam and intake, not the 307. Fix the exhaust and heads, and you'll be in the 250-275 hp range if compression is decent (i.e, not dished pistons). The real test is how it does on the track, or where-ever it is for whatever you intend to do with it.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

I have an K&N open element and I plan to get a Hooker cat-back. The heads are from the 305 that came out of the car.