Torque converter and 2.73 gears question

[cottonme173]

Good morning all! Been awhile since I posted and just getting back into my build. I have couple questions. First the truck/engine/trans/rear info I have to help :-)

1978 C15
454 .030 over mild cam, Edelbrock Air Gap intake, Demon 750 Carb.
TH400 Transmission
2.73 Rear End (this truck originally had a Diesel in it, which I assume is why the gears are as such) No I don't have the Diesel, Yes I want the 454 I built :-)

I am not looking for MPG, because I know it will suck either way LOL

This is going to be a cruiser, car show kinda car. Not my Primary Driver.

Nothing is in the truck right now except the rear of course.

The questions (finally I know)!
1- What torque converter should I put in to work for my application? I have the diesel one that I got with the truck, but I read it will not play nicely with a gasser.

2- putting everything together will this rear gear ratio work for me? Or is it better to go into the 3's somewhere? Again not looking for drag racing launches, but still want to have a bit of fun when applicable AND be able to go decent freeway speeds 65-70 without red lining. Can the 2.73s get by for now or will I damage anyhting?

I hope some of you made it to the end and can offer some advice! I don't mind changing the rear gears is absolutely necessary.

Thank you for your input!!