Need help with TC /flexplate install

Engine / transmission is a 1962 318 Poly with TF-8 19 spline. Bought a new PTC torque converter and ARP fasteners, 19 spline, 7/16" bolts. Old torque converter has an 11 1/8" bolt pattern but the new one is 10".

1) Besides needing a new flex plate, is this an issue? I have heard the 10" is for a 904?

2) My biggest concern is the mounting pads. The old converter has .475" tall mounting pads. New converter has .270" tall mounting pads. Flexplate is .105" thick. Bolts have .500" reach. New bolts WILL NOT work as they bottom on the converter before coming close to tightening up the flex plate.

With both converters side by side, snout down, the distance from the snout to the pad mounting surface is the same. The difference is that the new converter has a raised ring around the perimeter of the TC body whereas the old one does not.

Can I use washers? Cut the bolts down? Send converter back? I am awaiting a reply from CRT and am getting antsy as I was planning to drop the motor back in my car this weekend.
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