Have you looked in the race parts section??????
One just sold here for $3900. Another currently listed here in the race section for $7500. Along with these;
500 cube 400 base stroker shortblock,cleaned,magged,sonic tested,Arp main studs,align bored,square decked,bored and honed with torque plate,total seal file fit conventional piston rings,king rod and main bearings,molnar 4.150 crank,molnar h beam rods,Ross flat top pistons,balanced and assembled $3800

511 cube 400 base stroker same as above with GRP alum rods and 4.250 molnar crank
$4000

500 cube complete engine thumper carb to pan 13.5 to 1 BME alum rods $10900

500 cube street/strip 10.8 to 1 pump gas engine $9900 carb to pan
Doug