back cut large valves or not? on a 402 CID..

[wfot]

Hello all,
building a 402, 4 x 4 square motor.
I have a set of large valve heads. I think they are 90s. It appears that the porting was done by someone who knows what they are doing. they came with a package of parts that were all gathered for a 402/427 build.
Ports at the mouth are 37mm. Valves are stainless steel, 40.2mm and 36.7mm. planning on stage 3 cams.

The valves have a slight lip above the seat.... my question is should this lip be blended into the back of the valve for a smooth transition or left alone?
I think blended, this has always worked for me in past for other, non LT5 engines but I know this motor is particular with certain things.... hence want to ask before I do..

thank you in advance for any thoughts on this.
John