In comparrision to a guy going to a wrecking yard and buying a set of 360 heads for 80 dollars and maybe putting 600 into them with valve job and guides, valves/springs and seats, 600 dollars for bare casting is not a good buy.
For one of these members. That's 600 dollars plus valves, springs , retainers, rockers, springs, better valve job and porting. Sound like over a grand to start. They are a good option if your existing Magnums are cracked and you have all the hardware to begin with for 80$ because now you don't need guide work or seat work or resurfacing.
I didnt say anything about a 200 bill. Yes you did--something snide about cutting holes in them and dressing up in them for next Hallowe'en
Port volume for a set of heads that start out from the factory 2.02 flowing almost 230cfm is 155cc's...the 1.88 flowing 214 cfm is 160 , blame it on the valves underhead shape.
In the links I posted there is a la360 head flowing stock what it took you porting to get, and then 240's ..with a smaller valve than what is used here. Your bench must have leaks because any LA casting in OEM form has never exceed 195 cfm on my bench. A sparkplug left out is usually somewhere around +30cfm
If all people have are magnum heads, then good job on helping them make them work as good as the old stuff. Thanks.