Hello to all

this is my first post to this forum and i own a sweet 82 vette (11 years) and i was just wondering if i can inprouve what i allready did for minor upgradeds

Crane msd box with hotter coil.
k&n air filts
vacume operated cold air flap remouved from the hood.
advanced the timing to about 9%
180deg t-stat.

thats all i pretty much done so far ,but i was thinking of a hypertech stage1 or 2 chip and or a free flow cat . would those also help? or any other advise (Inexpencive easy upgrades that makes a diff) other than going into the engine, changing the cam, heads ect ect.