Fist time poster here but I want to share my experience with lionspeed heads, I've been involved with two engines with lionspeed heads, the first one is a lionspeed IV only drilled for one set of spark plugs and fsi distributor on my mums otherwise stock 28 sport coupe
I drove the car before and after the head and ignition, the differences were night and day, and for the better, I was only ever game to take it above 65mph once (it's my mums car and I didn't want to kill it just to find out what it would do) but at cruising speed and taking off the car was much nicer to drive, it also takes hills much easier than stock.
The other is one is a lionspeed III on a mildly hopped up banger I built for my otherwise stock 30 town sedan, the engine has a home made 4 into 1 header, repop burns intake, Stromberg 97, reground b cam, ported block, lightened flywheel and a few other bits and pieces
The engine is way healthier than the b that was previously in the car, the engine has enough guts to pull 65 with 4.11 gears (it could really do with some 3.78's or maybe even 3.54's because I don't want to turn it too hard). In summary I'm happy with both lionspeed heads on both engines
https://youtu.be/GV29aWeIy0M