I run 2 of the MrGasket 1/2" stacked alum/gasket heat shields to make a 1" 4-hole spacer for my 1405 on an alum holley street dominator intake on my 85 truck.

also blocked the heat croosover.

those 2 things fixed all of my fuel perking/boiling/vapor locking woes here in FL on the 10% e crap.

no mere heat soak on mine, 40 mile ride you can not touch the intake but carb is luke warm to the touch.

same thing for the holley 6210 spredbore I run. used the same spredbore Mr Gasket 1/2" alum/gasket heat shield x2 for 1" 4-hole spacer with heat cross over blocked. carb barly gets luke warm/no issues with crap gas here.

the 440 got the same 1" 4-hole spacer set up with heat blocked..run a 750 edelbrock on it with same results. 40 mile ride and carb is luke warm at most.

I even liked the edelbrock q-jet I had on the 440 with the stock q-jet 5/8 fiber open gasket. carb stayed cool.

I tried a few different types of spacers for heat reasons and the Mr Gasket stacked alum plate/gasket worked bestest for me.

get the heat blocked and run the mr gasket stacked plate heat shield.