with a custom manifold, you will still lose air conditioning.

if it doesnt interfere with the ac compressor, it will still interfere with the heat exchanger and fan. you'll need to upgrade the cooling system to handle the H22... if you go turbo, a Fluidyne radiator for Civics will be required, as an Integra/full size radiator will become a clearance issue again.

JR does make a blower for the H22, but it wont fit your civic due to firewall clearance. firewall clearance is one of the reasons why JR only has one for the 1997+ Preludes... the jackshaft and belt drive setup will also not fit between the wheelwells on a civic.