To guide you with a choice like this -- there needs to be MUCH more technical information about the motor. You need to know the piston static compression or how much it's in the hole... you'd need the cam specs -- lift etc - because this is critical info to match the FLOW RATE of the heads to the valve lift etc of cam... and the chamber size of the head to the compression ratio of the pistons. Without that info -- you get it wrong and buy too large of a head and have a lazy motor... with no bottom end. Too small and raise the compression too much and you have a motor that has pre-ignition and you knock a piston out.
If it's not a daily driver --- and you don't have the written specs on the parts you have --- you can pull the heads and intake off and measure how much the piston sits in the hole --- and get an idea for the shape of the top (flat top - or domed etc and the fly cut for the valves) -- and if you don't know the spec on the cam - you can measure that with a follower and a dial indicator. It might sound complicated but it's not.
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