[wyocobra]

Try Performance Auotomotive Warehouse (PAW). They show some "offset" aircleaners in their catalog. Mainly large diameter with base that sags down over the carb. Beware of linkage, distributor and other clearance problems on the underside. Have you considered raising your hoodscoop or lowering your engine?
Lower profile intake manifold?
My BBC fits ok in my LS but am now in the process of raising my hoodscoop to accomidate oval aircleaner of greater height. Should only have to raise about 1/2 to 3/4 inch.