i am not sure what the isky spacer is for but i am sure the double roller chain is thicker than the stock one, i assumed the timing cover would work but as stated earlier i had issues with the crank gear on my 58 and had to install a OEM timing chain. if everything looks good otherwise install a newer aluminum timing cover. be sure to check the crank gear, if you lay both crank gears side by side you can compare the bevel that faces the block, my original 58 crank gear had about half the bevel as the new double roller gear had.
