Yes, the HEI distributor is bigger, and in this case bigger is better. Swapping out and replacing a distributor is as easy as sliding your feet into a pair of tube socks. Wait a minute, I take that back. I have watched my young son on occasion put his socks on backwards. You'll know in a hurry if you have the distributor 180 out or if the rotor is pointing in a different direction from where the old one was positioned. Once the new distributor is in place and the cap back on, run a 12-volt lead wire to the appropriate terminal on the cap and reattach the vacuum line.