The liquid heat riser is a must have with a header IMHO. It will make it warm up nicely when it's cold and keep it from vapor locking when it's hot. You can buy one as a kit or you can make your own. You just need a square piece of thick plate (the kit ones are aluminum but steel would work if you powder coat it) drill 4 bolt holes to match the bottom of the intake then drill & tap 2 holes that you screw 90* right angle fittings into. These are for the in-out flow of coolant. Make sure you put an air bleed into the heater hose at the highest point near the firewall and you're ready to go.
Randy Rosetta KDØKWX TLCA #19351 69 FJ40 "Meanie" & 1970 Boss 302 Mustang