The accell 'shorty' plugs are really autolight racing plugs that you can get at half the price of what accell sells them for.
Is that a cast iron head? then ngk are 5673-8 are what you'd want, they're short race plugs too but cost maybe $18 a set. Accell gets above $40!
Nice truck! Get yourself a set of taylor 90deg spirowound for that smallblock, you won't regret paying the money and they have the smallest boot for the most clearance and the unmade (do-it-yourself set) are long enough that you can run them under the header as others have advised.