I'm wanting to install a new set of heads on my 85 Corvette. Is there a difference between the 85 and 86,87 heads? Will they bolt right on my 85? I found a set of edelbrock performers for $800, but the guy said they were for 87- 91. I think. I'm not sure when the LT-1 came back out. Will the aluminum 113 heads bolt right up? I know they started putting them on in 86. Also what size injectors does my car have? 22#?