How would you build a low 10’s street car

My 68 Barracuda is 3650 with me in it; and that's with an Aluminum top end,a Passon aluminum trans box, an 8.75, 4 aluminum slot mags, a GVod, powersteering and power brakes,and no AC.. The fold-down rear seat will take 64# off that, and the TTI dual 3" system will shed another 72#, the bumpers are 30 and the heater is 16, and I was at 195 with helmet. 3467 is the lightest that I could easily make it
But I have a 360 so 3650 is nothing to her.
According to the Bulletin Book a 10.2 requires a P/W ratio of .179..... with a SuperStock suspension. If you get yours down to 3400 with you in it;that would be 3400 x .179=609hp. But if yur gonna run street suspension , you'll need more power for a 10.2. 700 might do it.
609 from a 340, and into a 4-speed is not something you wanna build as yur first project.

A mid 12 with street suspension at 3400 works out to 3400 x .104=350hp, an easy target for a 340. And a heck of a fun street car. At 400 hp and still clutched, she won't like 2.94s;forget thatchit. With a 2.66 low gear, she'll be ornery with anything less than 4.10s. 400hp with a 340 is about a 245* @.050 cam. And don't even think about fuel mileage. Between that cam and 4.10s, you'll blow thru a tank of gas in a couple of hours, on a good day.
A know a couple of guys around here with ~500hp 340s,normally aspirated. They don't drive them. They trailer them to the shows; Start 'em up to get on/off the trailers, blip the throttles a few times, idle around the fairgrounds, and trailer them home. That's what guys do with a 500hp NA340.
With a 350 hp 340, you drive it everywhere all the time, and slide her sideways every chance you get; 10,000 miles a year. By 400 it is fast becoming a weekend warrior, and you are thinking " you shouldda had a 367". and by 430hp it drinks $100 bucks of gas every weekend and around here that is a days pay, so you better get married so somebody can afford the mortgage payments. And if it throws a rod bearing you better have some comfortable walking shoes.
Or is it just me that thatchit happens to? lol
low tens with a street 340/4-speed @3400#, yur geared for a trap of over 130 mph; that's 4.30s with 28s at least. With the GVod that comes to 2600@65mph
Yeah the 67-8-9 Barracudas are the tank A-bodies of those years, but daymn they are good-looking. and they accept 295s back there in the factory tubs, with plenty of room to spare..