The 340 is the biggest POS V8 Chrysler ever made.

A built 283? Seriously? With 283ish cubes? Normally aspirated? In an ElCamino?
That would take about 1.3plus hp/cube,right?
Doable I suppose, but why.............
mid 70's and because he could, don't doubt me, because your 367 wouldn't stand a chance. lol not a chance.