1987 350 block

[hugger6933]

The flywheel is different I forgot to add that, the blot circle is smaller due to the hub size on the crank. The intake will work if you drill out the center bolt to 90degrees from the older 74. But, you said you were gonna use older heads? why ? Do you already have some or does the motor have the heads. The center bolt heads flow decent with the revised chambers they have I would put them in the upper range of factory stuff excluding maybe the vortecs [of course] wnd the 'double
' hump heads and the corvette alum w/58cc. Jim