KENDELL - I don't think I ever had my tired old 307 over about 5200-5300 RPM, I was however in third gear, little Muncie 3-speed, 3.08 gears and the rear tires were something like 27-28" tall, figured out about 120-125 MPH.
The engine was coughing & sputtering the whole time! I had put an Edelbrock Streetmaster intake on a couple months before and the adapter to put the 2 bbl carb on the 4-bbl manifold made it so I had to run the top of the air cleaner right-side-up. And hour of "Shop time" and the filter housing was modified with an enlarged inlet and a second almost as big inlet 90 degrees away....no more coughing & sputtering above 5000 rpm, but those were just 1st & second gear pulls. Poor Man's dyno ya know.
SON's got a good set of Cleveland 4 BBL heads out in the shop. We just need to find a good short block to put under them, drop the results into a SWB 80's RANGER and go embarrass some poeple! Most of the "Good Cleveland Parts" are all "Down Under", Australia built Clevelands for several years after Ford US stopped.
NOW, to keep this On Topic. Ford also made Industrial engines based off their great little 60 Deg. V-6's from Germany. The early 2.6 & 2.8L V-6, and later the 2.9L EFI V-6 in Rangers & Bronco II's. HOT little engine!
I worked for a local seed corn company detassling corn a couple summers back in the 70's. The one brand of tassle cutter the co. hadwas powered by a V-4 Ford industrial engine & 4-speed trans. AWESOME little engine. VERY compact, water-cooled. Seems like it would have dropped right into an SGT.