one thing i have never tried and am ready to find out if wil fit and work are the '72 and oldr SB ram horn exhaust manifolds, will any of them fit and clear the 2wd suspension motor cradle and stock clamshell motor mounts? straight down exits or angled back exits? no one makes carries head pipes for the '73-up sbc common log style manifolds, but they do make them for the 72 older trucks and i need exhaust asap badly for my bone stock '75 C20 350 daily driver beater, it is now down to the original stock rusted out and splitting open y-pipe with a super old rusted junky tube muffler. all falling apart condition bad... and i cant find anyone around here or anywhere with any exhaust 2-1/4" duals for these trucks anywhere around here or anywhere online.. just dont exist, impossible,.. so im hoping to get 72 older exhaust and put on ram horn manifolds, it looks like.. i have a couple or few ram horn manifolds around here stashed. i remember that the 73-up log manifolds wont fit work with stock 72 oldr sbc mounts because the log manifolds sit down on the clam shell frame trees before the mounts touch the frame trees. but ive never actualy tried any ram horn manifold with 73-up clam shell mounts. dont the corvettes use clamshells with the ram horns? if those work together clear then they should in a truck too i would think? same bolted distances apart same motor block dimensions etc... do the vettes have a susp motor cradle under the motor like the trucks though? center dump? who knows what for sure? i need 2-3/4" duals badly asap somehow,... and i totally give up posting ads in this area, trying to find anyone with any exhaust dual pipes system from a parts truck anything.. because there arent any...around here at all anymore. they all got scrapped lot of years ago around here, and are long gone now... impossible.,. im not gonna run headers. i want manifolds. here is a pic that i found on the interwebs, of a stock ram horn center dump exit manifold on a truck with 72 oldr motor mount... but there is no frame tree bracket. and since it is not clam shell style mount, it doesnt help me at all in determing if it may clear/work with a motor mount 73-up 2wd style anyways..