big block pontiac or buick bellhousing

im doing a caddy 472 swap into my f250 pickup i need a bellhousing so i can put in a 833 trans thats a three speed with overdrive i need the overdrive because the gears in my truck are too low for the caddy engine and i cant find a used dana 60 with at least 3.54 gears and i dont want to blow up the caddy by using the t400 trans at 55 the rpms are 3350
i will trade my 390 and t18 trans for the bellhousing and flywheel
thank you
mike davis
605 south second st #3
tucumcari new mexico 88401
505 461 1032