Throw in your.02 on Torque Converter Suggestion

I bought a nicely built never been fired 318 from a speed shop that got the motor from a customer who bought the 71 Demon it was in with the intention of having the shop I got it from build and install a big block in the car.
The owner of the shop pulled the oil pan and intake and tells me the bottom of the motor was stock and super clean. The cam is a clone of what came in the 70 340's.
The heads are 74 318 heads ported and polished with hardened seats with 1.88 intake valves and 1.60 exhaust valves installed. The heads are port matched to the intake and the 360 Truck exhaust manifolds are gasket port matched to the head
The intake is a Performer with a 650CFM Holley.
The builder was following the classic path to get 400 HP from a 318. Will it get there? I hope so.

Anyway, I found a nice 904 with 300 miles on it since a rebuild, and I need to choose a torque converter to go between my new motor and my new trans. My Duster is a 74, that was a 318/904 car with a factory 8-1/4 rear. The tag on the rear is gone, but it's pretty clear it's never been open.

I'm just going to drive the car in the summer to cruise nights and the beach and on Sunday mornings to go get bagels....

Please give me your valued opinions!

Thanks!