You will be fine with the 268H, as the gears and stall are good. Compression is a bit low but it will work. And work with 87 octane with lots of timing. Stall is a little high as 2000 or 2400 rpm would be enough.
Use 20 degrees of timing at idle, 40 total, plus another 10 from a vacuum advance canister (adjustable, with 10 degrees of timing and plugged into a manifold source. So, it should have 30 degrees at idle (20 + 10) and 50 total (40 + 10) when you rev it up in park.