1969 C10 with 3” magnaflow exhaust

Idle rev and walkaround of my 1969 c10.
Don’t know the engine specs for sure but it’s a more or less stock 350 from the late 60’s or early 70’s with a si for plane aluminum intake 1 1/5 long tube headers into dual 3” exhaust with 14” case magnaflow mufflers dumped at the axle. Overkill for now but the truck is to get a cammed ls engine in the future.