Too many, think of street stock, (those dudes nowadays that spend tens of thousands do make their car as close to out of the factory, including over spray, are not gearheads, they are absolutely complete morons with too much money).
I NEVER judge any Detroit muscle car by how it rolled out of the factory, back then it was a unfinished work whose ability was controlled by the owners pocket book.
It could be as radically fast as one wanted or could afford.
Remember this was in the day before online crate engines, you found a speed shop and did on your own what you could and hired out what you could not.
I remember when was going to, and finally did, put on a barely muffled side exhaust system, and went to
Headers by Ed in Minneapolis.
I found his address and drove there in the middle of a block in a totally old school residential area; I drove down the alley, the kind town used to have on every block, and pulled up to a garage, not the kind built for working on cars , the kind build for a family, and not attached to the 1950s house.
He advertised in most of the major hi-performance magazines back then , I found it in Hot Rod; we talked and he said he could do it, and would, but it would be best if I checked other sources, as it would be FAR cheaper for me to do so.
I put on Thrush stock car racing header mufflers and cobbled up side system to go with it, which I did at a local speed shop in my home town.
My Boss, I did not install it had an after market rolls bar, zero emissions crap, headers, at first a 650 double pumpers, which was stolen off of the car, one night , so then I put on a standard 780, as money was tight and that was quickest cheapest.
The 650 was actually a better size for that engine on the street.
I bought it with over size tires G60, which I SHOULD HAVE replaced with different ones as they were the death of the car and nearly me. Rock hard SOBs that broke loose in a corner, all four, but they were great for smokey burn-outs.
It would have , even with the rock hard SOB tires easily been a lot quicker than that factory time.
One good thing, and the mechanic at the speed shop I bought the new carb. from and put it on, when I remarked at extremely good mileage I had been getting at high speed cruise, with the double pumper.
He told me, unless you pushed the linkage hard enough to open the other two barrels you were cruising with a 325 cfm two barrel and told me that 650 was actually a better fit for that engine but cost a lot more in 1970s money back then.
After I wrecked the car, the police found and returned the double pumper I bought it with.
