Help me please tryin to beef up 318

Per #68
With no other changes; your car will slow down. From idle to 4500 it will be slower. And since your cam is long done by then , it will be slower after that too.
It will seem faster from about 3500 to 4500, only because it was so much slower, from idle to 3500. I can tell you that from personal experience. That was with a factory 340-AVS top end on a stock 73short block, 340log manifolds, and dual exhaust.
You would get better results putting the teener 2bbl top, on a 340 short block. Done that too!

Others might tell you different. But until you put that combo in a C-body, it's hard to tell. Cuz with about 1000 pounds less to pull, in an A-body, things happen faster..
I tell you what; take your car out on the highway . Drive it in second at a speed higher than can be kicked down into first. Keep it in Second and roll into it. Have a chubby buddy with you holding a stopwatch. When you hit 2700 or so,nail it.If the tranny kicks down, start the test from a higher rpm.But always start from that new rpm, and give it about 100 rpm to stabilize before starting the timer. When the tack crosses about 2800 start the timer. Shut the timer off when you hit 4500.Shift to Drive and pull over. Repeat 2 more times and average it.Write all the data down. I guarantee if you don't write it down, you will/may forget, and not have a proper basis of comparison.
If you don't have a tach, use the speedo. Time it from 50 to 80mph, still keeping it in second, or 55 to 85 if it kicks down early..
Go back to the garage. Bolt the big-port heads on, and the same top back on. Retest thrice and average it. Use the same buddy, and the same road, and the same directions.
The stopwatch won't lie. Prove me wrong. You won't hurt my feelings.