Some good advice from BackPacker & n5296s. Years ago I saw Duane Cole perform in his clipped wing Tcraft. The announcer was making a big point of how Duane had replace the 85 hp engine with a bigger (150 hp I think) one for aerobatics. The first thing Duane did (once at altitude) was to shutdown the engine and stop the prop, then performed his full acro routine and landed dead stick - I always thought the 85 hp would have worked just as well.
I owned a 100hp 7ECA quite a few years and enjoyed it very much. The aircraft is vey capable of mild aerobatics but since it does not have inverted systems it's best to stay positive (unless you like listening to a suddenly quiet engine with an oil pressure gage point to near zero). Loops, barrel rolls, hammerheads, cuban-8, spins were very enjoyable but could take some time between maneuvers to regain altitude. The aircraft didn't seem to like snap (flick?) rolls very much except perhaps on top of a loop (where it's slow and unloaded). I made a few changes which made acro more enjoyable - adding a greenhouse roof (much better vis), adding aerodynamic balance area to the elevator (newer Citabrias all have this but the early ones have straight elevators just like a Champ) and gap seals for the ailerons & elevator. It didn't do things much better but it was less work / more fun.
I did not realize how much easier it could be until I flew a Decathlon and later some biplanes.
In today's world there is nothing wrong with the 5.5 US gal/hour fuel burn - and the slower acro pace will give more time to enjoy the flight.
Hank