Maybe someone who has run the F104 with the 103 front end, wheels and tires (foam of course) will chime in and tell us how they like it.
I've run against a couple of em with my 103 on foam and they weren't on pace although they were faster than the 104s on foam.
At least that's what I gathered from them.
I like to call em 103.5's.
Still think the F103 on foam is the boss.
So, who's out there running these?