I wouldn't count on them being available. I have had the 4.25 bore block on backorder with Jegs for months, and just this morning I got an email from them saying they were canceling my order.

---Original Message-----
From: Steve Miller <Steve.Miller@jegs.com>
To: MRRANDYJ@AOL.COM <MRRANDYJ@AOL.COM>
Sent: Wed, Feb 6, 2019 08:24 AM
Subject: FW: Order - discontinued back order

Thank you for your order. Part ~312-P5160149AC is discontinued. Mopar Performance has not offered any replacement item. Your backorder for this item has been canceled. If you have any questions please call us at 1-800-345-4545 and speak with a tech sales representative. We apologize for the inconvenience.

Jeg's Customer Care