We used a square piece of 1/4" plate that ran from the two bolt holes you mentioned to the pan rail. The plate was shimmed out to parallel to the block and drilled the plate for the pivot ball so the zbar was horizontal. With a manual trans, exhaust becomes an issue. Stovebolt headers worked for my 66 and I believe Cliffords may also work.
I have seen two methods for the right side mount, but both require the use of an electric pump, which with tbi will be necessary anyway. One is to modify the stock rh mount adapter (metal portion) with plate to attach to the stock mount ing position on the subframe. The other is to modify the subframe to accept the stock mount. Either way welding is required. Also, if I remember correctly the top hole on the bracket that mounts to the block will need to be elongated to get the three bolts in.
