If you will notice on the Parts ILL blow-up, the MUST (351C) assembly is detailed in Ill Details D & C. There is no 3C510 (Brkt) @ the pump. It seems the assembly (hoses) are held steady @ the brkt @ the control valve. So the setup you show seems to be correct.
HOWEVER...
MPC lists two pressure hoses by build date.
D0ZZ 3A719-H (Before 1/26/70) @ 22 1/2" L, and
D0ZZ 3A719-E (From 1/26/70) @ 25"L
There is no cooler (3D746) listed for the 351W or C, just the BOSS 302 and FE installs.
It
may be (this being the first year of the 351C install) that the later hose may have been an attempt to correct an installation problem (TSB). You would have to have both hoses to compare.
Usually, there is a metal strap band attached to the hose asm (if OEM) to identify the asm. If you can find this and the production date it may be that the problem can be corrected. The metal tube being that close to the exh manifold will cause the fluid to pickup extreme heat.
Maybe some heat wrap or a fabricated heat shield? It definitely needs a cooler (IMO)
SPECIAL FORD MUSCLE FORUMS KULTULZ DISCLAIMER-
The above information is only my opinion and some information may have been copy and paste in nature. Your opinion(s) and mileage may vary.