In my case the serpentine belt stays on better
probably because it has an idler pulley
keeping it from bouncing, especially over 6300rpm (to 7000)
In my experience far less slippage & no squeaks/squeals
with the serpentine belt too
my girls bought the dual 6 rib serpentine alum. crank reduction pulley
from Magnum Force Racing (March Industries) as a B-Day present,
my 50th some almost 10 years ago now, It's $100+
I only had to buy a 6 rib alum. serpentine alt. pulley
& 2 short serpentine belts
so it wasn't much if any more of an expense,
nothing like the pricey huge bulky kits,
with a mile long 'snake belt' & 2 or more idlers etc.
my Unisteer rack & pinion PS pump
came with a 6 rib serpentine pulley already
everything was a sort of 'custom fit', on my application
alt. bracket wise was stock style, top mount for a BBM
just chromed, but rest is easy stuff, like different spacers (chrome),
a couple longer bolts (chrome) etc.
& it looks pretty good, to me anyway
even more important the function is flawless
(I know you said you don't have a PS pump,
so you could do a single belt & crank pulley
with a regular routing like a v-belt would be
no fancy stuff or expensive kit needed)
I have 2 separate belts,
one to the PS (Unisteer rack & pinion) with an idler,
it far more surface on the pulley never gonna' throw it
(easier to adjust & keeps it away from the water-pump)
& one is directly to the alt.,
with a dual crank pulley
neither goes over the water pump, it's electric
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I think a good deep groove V-belt & an idler
would do an equally good job, marginally more slippage
probably not noticeable differences
(
I had issues with throwing v-belts at higher RPM's, even with deep groove steel pulleys )
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in my 68 RR
sorry the photos aren't very good,
I didn't take any photos of it with out the other stuff already mounted
it's a tight fit too, custom rad & shroud, Perma-cool 3500cfm 16" electric fan
35gpm elect. Proform water pump
& the idler etc.
this is the alt. belt & going down to the back slot of the crank pulley
View attachment 728453
you can sort of see the idler set up, mounted off the water pump,
plate 7075 alum. .250", with a spacer & the idler pulley
to keep the PS pump belt away from the electric water pump, more belt/pulley contact too
my car is sort of a drag car in search of a corner, I wanted PS, where I live, in the sticks
View attachment 728452
View attachment 728451
good luck