Thanks guys, The 261 I have has no boss cast on the block like the 235 did. The 235 had mounts like the V8 engine but were bolted to the side of the block right behind the timing cover. The 261 also has a set of mounts in the center of the block that have three bolt holes and look like V8 side mounts. The 55 front cross menber has some holes to the front but look to wide for a timing cover mount. Have not taken the V8 out yet. Still building the 261 and driving the truck. Might have to bolt up to rear mounts and see what works for front mount.