My Dad used to have a 77 B200 3/4 ton conversion van....... the medium length size. Came with a 318-2bbl.
We installed a re-ringed mid-70’s 360, 1.88 360 heads, std Performer, Holley 600vs, headers.
Ran the stock converter(used a weighted flex plate), 3.23 gears, L60/15 rear tires.
Towed a 3700lb 79 Córdoba on a 1300lb open trailer all around the hills in New England to various drag strips for years. Plenty of power.
Oh yeh...... used a pointy nose Comp 268H in it.
One day at the track there was some issue with the car that was discovered before the first time run was even made.
I don’t recall what it was, but the car wasn’t getting raced that day.
Unhooks the trailer from the van, ran it in the street class.
Went 15.60’s.