New guy thinks he has a C20 Longhorn

[patrickhenry]

Hello to all! Thanks for letting me "in"!

I think this because it has 8 leaf springs, versus the coil springs of a vanilla C20. Is that true and what else should I look for?
How many of these were made in my year of 1969?

-other info:
it has the C20 and Longhorn emblems
VIN#CE24
BLOCK#221TFD
4 ON-THE-FLOOR (I CALL IT THE "STUMP-PULLER")
wood-slat bed with the extra bed extension
bench seats-bare bone "Spartan" interior
3 gas tanks and external elec hook-up
heavy duty rear bumper with hitch hook up
I think the rear end is a 410-how do I confirm?

Thanks in advance