You're a fortunate man- - - -you actually figured out that "modified" is not necessarily "good" before you butchered up a nice old truck! Now, find a Chevy Nova somewhere in the late 1970's vintage, scavenge up a good Turbo 400 or a 4L-80 if you want overdrive, and a Ford 9 inch rear axle, and build yourself a stoplight racer with that mouse motor!
Jerry