the c r ??? . canffields are good heads the 310 cc will work you can try 119 cnc but i would o deck the block to get the cr up run the fel-pro head gasket f1027 and howards cam 595/609 286/292 250/250 LS 110 this cam will work but I like the 639/645 302/310/ 268/278 108 if this will fit i would run this try to get the cr up run the direct lube soild lifters and the intake team g 3500 stall to 3800 the rear gear is fine