440 Cam selection help

I have the xe 274 cam in the 440 in my Duster (in the engine when I bought the car). Also came with stock 452 heads and 8.0-1 compression with an Edelbrock performer intake,Edelbrock 750 carb, and tri-y headers. Ran ok. Not fast by any means. Switched to cnc ported 440 source heads,performer rpm intake and Holley 750 hp.Night and day difference in power. Even with the 2" TTi headers I put on. Too big for this combo and kills low speed torque but in anticipation of a bigger engine later. I wish I had run it with the smaller tri-y headers.Would have had a lot more bottom end/midrange I'm sure. My engine would like 2 more points of compression as well.

With the performer intake 3.23 gear would be fine. With the street dominator intake 3.55's may be the better choice. I have 3.55's in mine and am happy with them.I do plan for much more power down the road and 3.55 is a good street gear IMO.

The 1 3/4 Tti long tubes would better the tri-y everywhere if the extra $$$ doesn't break the bank. It would be fun to see the difference with them on my weak need smog motor but I am not buying 2 sets of headers.