[homemade87]

A note on the heads . If you are pulling the heads I would use the 243 being you already have them ( both in stock form ) . There is some advantages over the 241 . If not pulling the heads I would leave the 241 on . They are a decent head with a little bigger chamber than the 243. The 243 will give you a little more compression which is a good thing in that engine. 241=66.67cc , 243=64.45 . The runners are 241=200cc , 243=210cc . You should be around a 10.5 to 1 with the 243 .

Also why do you have to pull the heads ,is there a problem . Do not know how many miles is on your engine but if the heads come off I would put some new lifters in as well if north of 150,000 miles .

Also you are pretty much at the max spring lift for stock valve springs with that cam. I would also consider a spring upgrade . Your lifters and cam will thank you in the higher rpm range .

Just some food for thought .