I have just bought an alloy 2" supersucker for $60 new off RJ. I intend to try it first meet out next year but will swap at the track and jet to see what it likes, 2 engine guys on here highly recommended them, one being Dwayne.
Randy my set up is very similar to yours engine wise.
Mick


69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36