Need Help: Fuel/Air management Question

A Pro-M MAF is best at 73 MM or greater considering your future plans.

The 30# injectors and 70 MM TB are going to be way overkill for a stock motor, but will work fine for a 347 stroker. You may have some driveablity problems using them, The 70 MM TB will decrease your low end torque somewhat. You may need a custom chip burned to get the 30# injectors to work with the stock engine. Either that or experiment with turning down the fuel pressure. I would keep the stock 19# injectors until you do the stroker thing if the car is running good. You can send the Pro-M MAF back for recalibration (cost maybe $100 to get it done) when the time comes to switch to the 30# injectors.

"...My car really breaks up on high rpm around 4000 but my heads are ported, along with intake, new roller rockers 1.7 and full exhaust/headers. If I just put the new fuel pump in will it pull hard all the way through?..."

You are under the assumption that it is a lean condition creating this issue? What evidence supports this?

Are you still using the stock valve springs and/or lifters? If so, perhaps you are experiencing some valve float. What is the condition of your alternator and distributor? Perhaps you are experiencing a lack of voltage or missfiring. Along those lines, as RPM increases, voltage may drop to your fuel pump...just when you need it most. A voltage regulator such as a Kenny Bell "Boost-a-Pump" or Jacob's Electronics "Accuvolt" unit would solve the issue.

4000 is not high RPM, even for a stock engine. However, there may be several reasons for power loss as RPM increases.

Just trying to extract some more information so that we can help out.

It MAY be a distributor and/or TFI module problem that is common to the older 5-ohs. However, this typically occurs, at some extent, across the RPM band. The distributor bearings can get a little play in them and not want to maintain a steady ignition advance creating minor missfires or surges. The TFI module may also create little ignition gremlins, as well.

I had a similar problem with an intermittent miss at all RPMs...idle, cruise, etc...pulled my hair out trying to find it. Got a new MSD Billet distributor/TFI...cured the problem.

It MAY just be a tank full of old fuel. Sometimes just burning off the old stuff and filling it up with fresh 93 octane does wonders.

I don't think your speed density car cares about the ported heads/intake, as the majority of the computer's information is being retrieved before the intake.