102's have the same lovely valve geometry as the 103's.
I'd do the guides but, a set of seals should get it going for awhile.
Shell rotella seems to do really well in these engines for both comsumption and coking.
If you opt to do seals, check the rocker boxes to be sure they will hold torque before pulling them. I've seen many a 103 rocker box bolt that was stripped in a previous repair attempt.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.