I'm getting ready to put a 350 in my 89 T/A and getting my heads ported on the new engine. However, I don't want to remove my current TPI system on my 305. Does anybody know thge inside dimensions/diameters of

Intake ports(square).
Runners
Edelbrock TES headers(basic set purchased from Summit).

I could remove some of these if I have to but
trying to avoid messing with the headers.
jeff 89 305 T/A

 

Are you doing this yourself, or sending them out? If sending out, is this a hand job or CNC outfit?

The typical practice is to match the ports to the gaskets on the intake, leave the exhaust slightly smaller than the header ports. A CNC house should have all the data on file.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ4 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (ported World 305 heads, Crane PowerMax cam, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, 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 a friend that has been building engines for fun (and racing) for about 25 years. He generally only deals with older vehicles, ie, not emissions regulated or fuel injected. I had gotten an 89 GTA 350 longblock and he has rebuilt it; now just waiting for me to drive down there and install it(2.5 hours). He was just trying to get a bit more done on the heads before I got down there, to save time. I guess he just wanted to be sure of what the headers were like, even though he has a gasket that came with the gaskit kit.
jeff