Don't buy a used 392 for 6k , most those people selling those are just marking up the part because they think it's gold.

SRT 392 Short block from FCA part No 68223196AB , is any where from 2970(+250 core charge)to 3500 including core.

last 2 quick builds I did were short block 68223196AB $2900,+ a set of Eagle heads (53021608DF $325 each) swap valve springs over to Psi 1515 (265 from speedlogix) Comp cams 270 VVt ($685---yes cams are too F--ing expensive.
Ritter Drag pak from MMX for $700 (short version) Comp pushrods $120
Short Block= $2900
Heads + vavle springs $1000
Cam $685
ATI 918487 Damper $379

5k out the door not including my labor($500) and shipping.
yes they need to buy their own front cover($50-250) and oil pan ($50-500).

there are a lot of good new parts coming down the line for these engines.
as the market gets bigger the prices with come down.

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Some of us are so open minded they only see their View