What exactly are you putting this cam in?

The 108 LSA 509 is 248 @ .050" with 76 deg overlap. Everybody seems to be losing their minds over the converter and gear and if you are building a 383, rightfully so but if you are building a 493+ stroker, not so much.

I have that cam in my 9:1 493. I was really concerned I'd messed up when we fired it on the dyno and the idle was still loping hard at 1100 and maybe 8" of vacuum. I thought well it'll make some power but it's going to be a stone under 3000. Wrong! It made good torque right off idle and made no less than 500 ft/lbs from 2000-5000, peaking 600 ft/lbs @ 4000 rpm.
When I asked my builder why it still idled so rough given it had 53" more displacement to absorb the extra duration, he said 76 deg of overlap is 76 deg of overlap. It would idle like that if it had 800 cubes.

I ran it with the stock converter and 2.76 gears until the trans gave up and then I put in a T/A 2800 converter. The engine could pull the 2.76 gear OK at cruise speed but it wasn't "happy" much under 2500. 3.23's solved that.

Even with the 2.76 it ran 13.92 @ 101 mph with a spinning 2.23 60 ft in a 4800 lb New Yorker.

If I was doing it over I'd go with the 114 LSA 509 if it was still available just to make it more power brake friendly or ideally a custom .600"ish lift hydraulic with similar duration and LSA (if that is possible) to take more advantage of the E-heads.

Kevin