you would have to check piston clearance- if you know what the max lift you can use on your motor, you can use a formula to find the lift you will get. (lift is measured with 1.5 rockers so try to figure out what the lift would be with 1.8) otherwise you will probably have to find different length pushrods and maybe cut the pistons for clearance.
btw, im in the Sea bright, longbranch area- hope to see you at some of the car shows coming up