What exactly entails swapping from a non-vented Opti to a vented one?

I'll basically be putting in a whole new block (of indeterminate year) that will be worked over, and I want to know what the differences are.

Something about the cam dowel pin....

Also, how hard is it to switch from Speed Density to MAF?

 

http://para.noid.org/~muttvette/opti.html

 

dam thats a useful site! thanks

 

I don't get why you would go to the effort and spend the money to change to a vented opti. My stock unvented one went 75K miles. So I may change it ONE more time while I own this car.