Use shim kits to properly align pulleys. Crank pulley spacers are for small block Chevys. Kits include three shims.
Allstar Performance 48253 | Pulley for ALL48252
Allstar Performance All31035 Pulley Guide Each
ALLSTAR PERFORMANCE ALL31035 PULLEY GUIDE
Allstar Performance 31066 Crankshaft Pulley Shim Kit IMCA Dirt Track
Allstar Performance ALL31066 Crankshaft Pulley Spacers - 0.0625/0.078/0.125in
Allstar Performance 31084 | 1:1 Crank Pulley