Which way to go?

[V12T]

I have a never rebuilt, low compression 1976 440 in my 70 Challenger. It runs very well but I want to do justice to the car and rebuild it with at least the HP it should have had in 1970. I don't do burnouts, race or drag. I do very few street miles but I want some real power when I do floor it. Parts are very expensive for me in the UK due to shipping and taxes. I will get ally heads and roller cam and already have a six pack. I can't decide whether to stroke it with new crank, rods and pistons or just get some higher compression pistons and use the stock cast crank and rods. I know it's my decision but would welcome opinions.

 

[Chryco Psycho]

Aside from the shipping weight the 512 ci 440 stroker kit from 440 Source is close to the same cost as rebuilding the stock parts , the benefit is you have all new parts & a steel not cast crank , other benefits include reducing the rotating weight by 7 lbs .
As for the heads aluminum is not always better , I have ported iron heads & when swapped with Eddy heads that I also ported the gain was 3 hp for example , this is where you need to spend your $$ wisely not just buy a lump of alum . I would look at Trick Flow as the best choice right now .

 

[moparleo]

I know that gasoline quality varies around the world. How good is the fuel in your area. That is another thing to consider.
I would also invest in a few books on B-RB engine building. There are a few good ones on Amazon as well as other sources.

 

[fasjac]

I have a never rebuilt, low compression 1976 440 in my 70 Challenger. It runs very well but I want to do justice to the car and rebuild it with at least the HP it should have had in 1970. I don't do burnouts, race or drag. I do very few street miles but I want some real power when I do floor it. Parts are very expensive for me in the UK due to shipping and taxes. I will get ally heads and roller cam and already have a six pack. I can't decide whether to stroke it with new crank, rods and pistons or just get some higher compression pistons and use the stock cast crank and rods. I know it's my decision but would welcome opinions.

I refreshed a low compression motor many years ago with a 509 MP purple shaft, iron 452 heads, single plane alloy intake, Holley 750 DP and headers. This build was a low budget torque producing fun engine with 4:10’s in the rear. And very respectful with 3:55’s. Just sharing what I did. Didn’t have the money to do more. For a lot more power, stroke it as Chryco mentioned. Good luck to you.