Edelbrock Part # 7521 RPM Air-Gap intake manifold is designed for street 289 302-347 c.i.d. Ford V8 applications. The RPM Air-Gap incorporates the same race-winning technology that’s been used on our Victor Series competition intakes for decades. The Air-Gap™ design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. Includes nitrous bosses. No provision for exhaust heated chokes and no exhaust crossover. Edelbrock carbs will work with Ford automatic overdrive trans (AOD) when used with Lokar bracket SRK-4000, for more info call (865) 966-2269 or go to www.lokar.com.