PURS,
Get the block casting number and date code off the rear below the intake but right above the bellhousing. Casting number will be on left, date code on right side. That will help.
Then go to www.mortec.com and see what you have.
SC
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb
'72 Corvette convertible 454/4spd/ac, ps, pb
'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac
'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original
'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac
'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.
SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423
SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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