Somebody asked what to do if your aftermarket fuel injectors seem too short and dont seem to be seating in thier bores.
The standoffs on the manifold base needs to be decked about .156.
Meassure the depth of the mounting holes with a pair of verniers. three of them I think were 1.170 if I remember correctly and one was 1.215. keep the same relation and remove the material equally.
Dont remove more than this or your fuel rails may hit the runners if the runners are aftermarket large tubes.
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on a side note, that engine looks awsome jjlabinski.