Depends if you are running a long nose cam or a short nose cam. Long nose = you will have to buy an eccentric, washer and bolt. Short nose you will have to buy an extension kit. Hughes engines out of Washington, Il can fix you up. I bought my cam from Hughes and it cam as a long nose - I already the eccentric, washer and bolt. Of course, you can always block off the mechanical pump outlet and go electric.
Thank you John, that's the info I was looking for. Somebody does make the adapter to convert the short nose cam to do this. Do you have a part # for this application? And sorry about the "hijack" but OP may need to consider this too!