37 221 valve stem length too long? Help.

[scooder]

My mate Mart got it, use Ford valves!
The sbc "style" ones you have are just sbc valves, you got a stock cam so stock valves will fit without farting about. As the valves you have now will also need the springs shiming to correct the installed length/spring pressure.
Just use stock 8BA valves with the guides you have. Simple and no farting about.
Martin.