Couldn't you just drill a small hole through 2 of the hinge pieces when the hood is raised, and insert a pin (nail?) through the holes to hold it up? Pull the pin when you want to close it?
Seems to me at worst the hinge struts do 90% of the work, and you are just needing a little insurance.
FWIW, I bought new struts from RB for my RB hinges last year, and they now hold my hood up very well. I presume they need to be replaced every x years.
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Bill
'69 Camaro / 534 BBC / DSE Built
'67 C10 / LS-3 w/Magnuson / Roadster Shop Chassis (SOLD)
'71 Blazer / LT4 / 8L90 / Roadster Shop Chassis / Ride Tech Air Susp.
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