Originally posted by stinky jinx
I knew this post would bring a reply about how many times timing had been talked about,and actually I did looked first, but as I am fairly new to this board I am somewhat unclear on how to look up a specific question. So if you or anyone doesn't mind, tell me how I would look that question up.
OK. I type with two fingers so am a little slow.
Set your initial timing to 10 degrees with the vacuum hose dis-connected and plugged.
Now check your Total Mechanical timing. You are looking for around 34-36 degrees all in between 2500-3000 RPM.
Re-connect the vacuum hose. I prefer to hook it to the Full vacuum port.
You will probably have to lower your curb idle speed at this point.
Test drive the car. If when cruising in high gear up a slight incline you hear any pinging, drop the timing down 2 degrees and test drive again. If you do not hear any pinging you can probably increase the timing some.
I have a similar combo to yours.
350 Small Block, HEI ignition, Blockhugger headers, AFR 190cc 68cc chambers, aluminum heads, Comp Cam 280H (12-212-2), Edelbrock RPM Air Gap intake with a Holley 670 cfm Street Avenger, th350 trans with a B&M TransPak (street version), 8" Ford rear with 3.80-1 gears, P275/60-15 rear tires.
I run 18 degrees initial and 38 degrees Total mechanical all in at 2600 RPM and have the vacuum advance hose connected to the Full vacuum port. Starts excellent, absolutely screams when required, cruises at around 3250 RPM at 65 MPH. Runs on regular gas due to the lower than optimal compression ( about 9.1-1).
You can probably do a search by typing in "Chevy timing"