conventional cab? the 283 is a direct bolt-in w/ the repro front mounts, any SBC should fit fine w/ the adapter crossmember for the side mounts - 350's are common as flies
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics