Adding 100+ HP to this combo

[F-BIRD'88]

With 4.10's and a 28" tire the rpm at 60MPH will be just UNDER 3000 rpm at cruise... A tall 70 series street tire will work BEST.
Then a SHORT 26x8.58x15 P235-60-15) sticky street strip tire like a M/T ET street will work great at the track.

This thing is going to be a slug with 3.42's... Will be MUCH better with 4.10's or 4.30's RPM with a 28" tire and 4.30's is gust UNDER 3200rpm at 60 MPH cruise.
This is very reasonable. And allows the engine to move the 3800LBS.
A 29" tall street tire works even better with the 4.30's
P255/70R-15 With 4.30's and traction bars... It will hook too.
Cruise rpm at 60MPH will be 3000 rpm on the nose.

[travis]

You would get pulled over for impeding traffic at 60mph here

[Keith Morganstein]

The 3.42 is a good choice of gear for a street car.

A friend had a 78 Chevy C10 truck, short/wide about 4000lbs. 468 BBC, 8-71 blower, 2 x 4bbl, TH400, 3.08 gears, tall tires. Ran low 10’s, 130’s crossing the line in 2nd gear about 7300 RPM. A real slug that truck was...

[randy331]

The 3.42 is a good choice of gear for a street car.

A friend had a 78 Chevy C10 truck, short/wide about 4000lbs. 468 BBC, 8-71 blower, 2 x 4bbl, TH400, 3.08 gears, tall tires. Ran low 10’s, 130’s crossing the line in 2nd gear about 7300 RPM. A real slug that truck was...

Yes, but that'd be a very fun slug to drive .

Randy

[F-BIRD'88]

Shows the profound effect of SUPERCHARGED 468 BBC.
This is not a supercharged BBC.
Poor argument .

[Keith Morganstein]

You see, that was just an anecdote about different ways of doing things.

In the real world, a 10 second street vehicle is terrifyingly fast. Actually a 13 second car is quick, a 12 second car is fast and an 11 second car will scare the crap out of most people.

A sensibly built 400+ HP street machine with mid 3’s gears and no overdrive works out very well. 4.10 gears with overdrive also works well.

But this is the internet were everyone has 9 second cars and spews fantasy advice. Carry on...