i have a 350 sbc in a 1986 c10. i am wanting to change the heads out. the casting numbers now are 14014416 i believe they came off a 305. i know someone who has a set of 3927185 that i can get for 250.00. they have minor porting 3 angle valve job .600 springs and roller rockers freshly rebuilt. would i benefit anything from putting these heads on or would it hurt me. i will be installing a cam and intake also. any thoughts