400 budget compression HELP +++++

The cheapest way to take car of your problem without decking the block or buying pistons at this time is to offset grind the crank.
You mentioned a stroker later and 400 cranks are not valuable, so why not get a set of .060" under rod bearing and have the crank offset ground .060" You'll have $200 in doing it and a little effort, but it will give you what you want without disturbing the block. Or if you really wanted to zero deck the piston you could pickup a 440 crank (yes a little more effort) and play around with the stroke (destroke) and get your piston right at zero deck height

Tom