Overdrive choices- 4L80E or??

[Thumpin'66]

Hey guys,

I have a Blown 85 Monte that I just wiped the 2nd gear sprag out of. I want an overdrive that will hold up to my 508 RWHP. I am considering a 4L80E but am open to ideas. I am usng a full manual Trans brake valve body in my 400 on the street and do not mind it at all so a 4L80E with full manual might be the ticket for me. I build my own trannys so I figure I would get a decent core and freshen it up. I found one locally that came behind a 6.0 liter in a 2003 van and it has a slip-in yoke. I figure the higher 1st gear ratio of the 80E would help me to hook out of the hole with my 4.10 rear gear and tons of torque. I have read that the torque converters are an issue? I was thinking I might try the stock converter since my 6-71 blower gives me immediate torque and throttle response. I would appreciate any input you guys have.

Thanks!
Russ