383 power upgrade help

Joey N said

I have not really settled on a budget I don't want to go Chinese brand I'd rather stick with 440 source edelbrock so on I just don't know much about any of them

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440 source heads are chink heads.
Edelbrock are made in America.

Joey N said

Thank you I'm happy to be here could you tell me how I'd go about checking how fat they sit do I just use a regular tape or something special I have a picture of the pistons sitting in the cylinder if that would do any help

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Once the cylinder head and head gasket are off, you need a magnetic bridge and dial indicator. Zero out the gauge like pictured below with the gauge set low in the bridge for full plunger extension ability. The. Slide it over the the center of the piston and watch the need on the gauge rotate around and measure.