hi, if the engine is gold it's a 430, red was a 4bbl 383 in 58, turqoise was 2bbl 383 in 59, i've seen a yellow, i belive it was 2bbl 383 in 58. 58 was the only year for a 4bbl 383 i believe. i just looked at a tri-power manifold for one, they were aluminum.

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.

forgot about the carb. they were used on ford and IH trucks also. i believe the v12 linc. might have used them before the linc. v8. they used one like it on 54 merc. and 52 linc. only it had a round base and no bonnet. the truck carbs had governers on them.

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.