Had my 1052 ( flowed head v&h zorst bellmouths with ramair socks) dyno’d a couple of years ago as it was struggling to pull cleanly from a closed / part throttle first run 118 bhp on std size DJ jets but showing 26% rich dropped down to 127.5 mains ( 2 sizes below std) and gained 5bhp and still 20% rich.
since then I’ve dropped down to 120’s and it is a lot crisper just not had it back on the dyno