As far as findig the mounts, just peruse the aftermarket web sites or go to your local parts house to find what you need. On I.D.ing your 3 speed, the number is located on the rear face of the case in the upper right hand corner. The heavy duty 3 numbers are located on the left side of the case rear of the cover. I think just about any bellhousing from the late 60's thru the 70's should work with a few exceptions. The really small 3 speed has a different size pilot hole and won't fit the Saginaw. Hope this helps,
Scott
