318 f.a.s.t class , oem stock appearing

i want a street motor , but a 318 c.i. 2bbl and iron heads / manifolds that kicks ***... tired of 340s and 360s for my barracuda , got a 360 in my duster and a 440 in my gtx... but i cant imagine that it was so complicated to actually make it happen , i tought it would be easier to get some infos here with you guys ,

btw: i will not race in F.A.S.T class, im inspired by them , but want something streetable