I guess a lot depends on how one defines streetable. I have never driven my 78 Fairmont on the street since I finished it 30 years ago, but it has gone high 9`s, naturally aspirated with very little aftermaket equipment, no roller cam, no aftermarket stroker kit, no aftermarket heads etc. .030" over 427 Ford block, with cast 428 crank, solid flat tappet cam,stock unported cast iron CJ heads (with original 2.09"/1.66" valves), a 780 vacuum secondary Holley on a 50 year old Ford dual plane intake, a Duraspark distributor from a 76 F250. Lighter than most at 3100 lbs, with a 4 speed trans. Best of 9.97@132mph, shifting at 6200 RPM. If that too "fancy" the same car with a .030" 428 block, stock cast 428 crank, stock 3/8" rods, same flat tappet cam, intake & carb ran best of 10.03@132 MPH, also shifting at 6200 RPM. The 428 made 518 HP, the 427 a little under 550HP, I guess a fairly well sorted car helps to run OK without a big wallet or a bunch of aftermarket parts. Since my Fairmont only has a roll bar, it is only NHRA legal to run 10.00 ETs or slower, and I am still undecided if I want to make all the changes to make it 9 second compliant, I dropped in my flat top pistoned, pump gas, flat tappet cam 331 SB Ford, which made only 487 HP on the same dyno. Last Sat & Sunday, in 90 degree heat, it was running mid 10.2s @ 128MPH. Big HP numbers are nice, but i will take a well sorted out car with moderate power anyday. JMO