If you are replacing the internals this is what I did and it works pretty good.

*1987, MIE/340 (7.4) 454 4 Bolt Main Big Block

Dipped And Honed The Decks And Cylinders Cut .060 Over

Block Was Detailed With All Casting Debris Removed

*Scat 9000 Crank 4.25, 496 Stroker - cut .020 under

*Scat 26385716 - 6.385 in. Connecting Rods - Floating Pins -I Beam Forged 4340 steel

Howards Cams 120255 - Max Torque Retrofit Hydraulic Roller Camshafts, Hydraulic Roller Tappet, Advertised Duration 288/294, Lift .585/.610, 112 L/S

Howards Matching Valve Springs 98636 - 130# / 330#

Cloyes Gear 9-203 - Cloyes Wear Plate, .031 in. Thick

CCA-205 Cam Button

Maxspeeding Hydraulic Retrofit Roller Lifters

*Probe 496 Dome Top +18.0cc, .060 - SRS - PHV Series Piston Set

Clevite 77 Cam Bearings

*Federal-Mogal 4400 M20 Main Bearings

*King Engine Rod Bearings CR849HP

Cloyes True Double Roller Timing Chain

Mahle - 4.310 Plasma Moly Coated Piston Rings

Melling 10778C (Anti-Cavitation) Oil Pump

Melling HV Oil Pump Shaft

New Solid Harmonic Balancer

Rotating Assembly Fully Balanced

*Trick Flow Chromoly Pushrods TFS-21417800-8

Completely Refreshed Chevy BB Heads 14096188 / Open / 118cc / 3 Angle Valve

APR Head Bolt Sets

ARP 1.90 Rocker Studs

Norris S/S 1.7 Roller Rockers

Seal Power Gasket Set

EDELBROCK BBC R2 AIRGAP INTAKE

(Edelbrock 7202 Intakes Gasket Set)

Pro Comp 2752 Fuel Pump

*MSD Ignition

Pro Comp Distributor

Super Stock Coil

8mm Accel Hi Performance Wires

New Single Wire Alternator

Mini (gear reduction and fully marine) 3HP Starter

Edelbrock 800 Carburetor

12" Aluminum, Oval Air Cleaner With K&N Filter

Brass Freeze Plugs

Stainless Steel Bolt Set

4” Stainless Steel "Tall" Risers

496 MerCruiser Exhaust Manifolds

Sherwood Motor Mounted Raw Water Pump

Did you dyno this engine? Seems a little light on cam for a 496ci engine.

I'd just drop one of these in and call it good.

To answer the question that was asked I would look at a F.A.S.T. self tuning EFI system myself. But there is some good advice to be had here