CAMQUEST - Can I substitute Big Block CI for Stroker SB?

Just select the 318 engine for your buildup. Then go to the bore & stroke fields & type in your new bore & stroke. Be sure to hit enter after you type in each one. You can change the info in just about every field that way. If you save the combination you can pull it back up anytime you want to & play around with different combinations. There's also a way to input your own cam specs but it's a lot more involved.