Call Isky, They have never let me down. I use an ATI super on my GMC race engine. It's the only one that keeps the flywheel bolts tight. The one in the photo is a 292 shortened by Tom Langdon. They are readily available and inexpensive. I bought his because he had one done. There is a 3/8" plate behind the 228 water pump which has a 3/8" vee-belt to line it up. If you use any of the Chev V8 ones you can press off the water pump pully and use a flat one from a hardware store and put pulley on the front of the damper. You need extra space behind the radiator for this. The avitar photo has gilmer belt pulley system for the external oil pump, vacuum pump, and alternator all bought off e-bay cheap when guys went to cog belts.