Chrysler 360 w/ W2 Econo Heads, Headers, 30.over

There are adjust-a-jet meter blocks that let you 'jet tune' without removing the meter blocks, thats the diff with those.

Scamp probably bought the adjustable meter blocks that have removable restrictors and such which allows a finer tuning for a given app, but you need to know what you are doing.

The best thing you can do to start is by buying a holley tuning book and find out how a carburetor works, what does what when changed etc.

Hey I'm good with adj meter blocks, as long as you know how to tune otherwise you're just buying more stuff.

Most after market blocks are set more aggressively for performance/racing.

Before you do anything I would do as I mentioned before and experiment with the timing curve= highest initial possible with it all in around 2200rpm .....then tailor your carb.jmo