intake and carb sugistions

Sounds a bit small. A lot will depend on your heads and cam too but I suspect you can improve by going up. My motor is stock stroke but has a big roller cam and full ported Indy heads. I run a 950 Holley on it but when I had it on the dyno put a 1050 Dominator on it and gained 30 hp without no tuning. Have you done any work on the 850 with jets, air bleeds etc.?