No Bronze Guides, Any Reason?

loose guides will, as you most likely know, not allow concentric valve/ seat and will quickly beat each other up
they will also eat the seals and oil in the combustion chamber will...
get's worse from there
these are new valves?
I'd go with the K Lines with the internal threads they hold a little oil which helps in these unleaded days
and I'd find a shop with a Sunnen OD valve hone and OD hone the valve stems
you will quickly find any problems and also the hone also helps hold some lube
only takes a few strokes to get a smooth feel with the stone if the valves are straight andnot worn, tapered, bell shaped etc
cut the guides for viton seals if not already done
no use checking concentricity with loose guides- waste of money
and they might seal with alcohol- also meaningless
and no lapping with valve grind compound for any reason, even to check the seats- use dykem blue
your valve expands hot and the lapped seat will move and let's just say "not be optimal when hot"
check your spring pressures while you are at it, and stem heights
Did we mention going to the B3 website and reading the 4 tech articles?