Power glides are for 2300 pound race cars with a 700hp engine.
You don't have that. The glide will be a dud with 3.73's.
What is the car weight and rear tire diameter.
For a street strip motor you want to build with a 10.5:1cr (92-94 octane gas)
You are making critical errors in your combo plans.
383 with aluminum heads and flat tops and 0 or near 0 deck clearance wants a 65cc cylinder head.
you need to either gear the hell out of it or fall out of love with that glide and get a th350 or th400.