$3000+ Existing 318 block/crank Prices are approximate.
KB167 pistons $500
Bearings/gaskets 250
Cam/lifters (Howards) 365
Speedmaster heads 800
Timing set 100
Cam bearings 50
Stock oil pump 50
Misc 100
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2215
Block prep Clean 100
Cam bearings 50
Bore/hone 300
Crank measure/polish 70
Balance 300
Recon rods 100
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920
$3135 I'm sure it will be more but not twice as much I wouldn't think. This is a basic list so don't beat me up if something got left off. Things like cam bearings can be usable as well as the rods reconditioned. May be you have a pair of heads that don't need much. May be the crank needs turned. Add a couple hundred. Oh and rod bolts if you recondition.