Can I get a /6 in the 7's?

160 hp is certainly doable. However I want to see you get a Full fendered "A" body door slammer, below 1,300 lbs car weight, using 100% regular production body, engine, driveline and suspension parts. Not saying you can't do it, but!
Here are some official slant six records, taken from slantsix.org site. These cars run gas and no power adders.

Weight of 2000-2349#
Class .......Date.............Driver...................Record..........ET/MPH..........Car……………………Location……………….Weight
Gas Only
A/G......7/16/11.....Mark Etheridge............1/4 Mile ET.....11.436………….’62 Valiant…………Eureka, CA…………….XXXX#
A/G......7/16/11.....Mark Etheridge............1/4 MPH.........115.51MPH…..’62 Valiant………..Eureka, CA……………XXXX#
A/G......10/14/06...Seymour Pederson.......1/8 Mile ET......7.250…………..’62 Valiant…………Piedmont, NC..…XXXX#
A/G......5/8/04.......Dale Rose....................1/8 MPH.........92.632MPH….’80 Arrow…………..Farmington, NC……XXXX#

Weight of 2350 -2699#
Class .......Date.............Driver....................Record.........ET/MPH..........Car…................Location……………….Weight
Gas Only
B/G......9/12/10.....Mark Etheridge............1/4 Mile ET.....11.50……………’62 Valiant………….Sacramento, CA….XXXX#
B/G......7/17/11.....Mark Etheridge............1/4 MPH..........114.860MPH..’62 Valiant………..Eureka, CA……………XXXX#
B/G.....10/14/06....Seymour Pederson.......1/8 Mile ET......7.333…………..’62 Valiant…………Piedmont, NC…..….XXXX#
B/G.....10/14/06....Seymour Pederson.......1/8 MPH..........91.91MPH…….’62 Valiant…………Piedmont, NC…..….XXXX#

Weight of 2700# - 3199#
Class.......Date..............Driver....................Record.........ET/MPH………….Car……………………Location……………….Weight
Gas Only
C/G.....9/11/11......Mark Ethridge...............1/4 Mile ET....11.921…………’62 Valiant………….Sacramento, CA.……XXXX#
C/G.....9/11/11......Mark Ethridge...............1/4 MPH........109.604MPH..’62 Valiant………..Sacramento, CA.……XXXX#
C/G.....10/14/06....Gary Bruner..................1/8 Mile ET....7.873…………..’64 Valiant…………Piedmont, NC..........XXXX#
C/G.....10/14/06....Gary Bruner..................1/8 MPH........86.77MPH…….’64 Valiant………..Piedmont, NC..........XXXX#