OK, the only timing cover with provisions to check the cam endplay is the Comp, or the summit knockoff. Both use the thick front seal, so changing timing covers is out.
Denny411 is correct, Felpro makes a one piece with the thick front seal, several actually, it took a while for me to find them.
For reference, the one piece for thin front cover, two piece rear main, drivers dipstick is FPP-1885. For thick front seal, two piece rear main, pass side dipstick is FPP-1880. Unknown front, two piece rear main, driver dip is FPP-1881.
There is another thick/two piece rear/driver dip, FEL-OS34510T. Felpro says it's not for racing use. I ordered the 1881 and the 3451, I'll compare them once I have it in hand and post any visual differences.
jt