HEllo!
Haan dada..Kishti mein nahi....! paidal lee aata :D....! jeb mein dalke...
anywayz...wait a min bro.....!
@Levin bhai said in it very 1st post in this topic that
"think ,,aluminum block before you think further, rest should make sense to you that Toyota has done all the thinking for you already"
from that time he said "think" i am thinking....
and now i came on conclusion that...
Hey....A series came up with Cast Iron Engine Block and Cyl Head....:S they are not cast Aluminum Blocks....!
A series is all based on Cast Iron Blocks and 4AGE and 4AGZE are All Iron Blocks....!
5AFE or 4AFE or 7AFE...all have same kind of Block builds...Cast iron Blocks....!
https://www.pakwheels.com/forumreply_az_TopicID!44696~ForumID!10~pw.html
here we discuss it in details....:S as Ibrahim Bhai pointed towards 5AFE Iron Block...Bulb just blinks ke wait a min....4AFE Aluminum and 5AFE Iron ..yeh kaise hogaya...!
Well 4EFTE is from E series and E series based in Cast Iron Block Along With Aluminum Cylinder Head.....!he 4E-FTE Is Different From the 4E-FE Only Bcz Of Its Stronger Connecting Rods, Lower Compression Pistons & Different Head Gasket.
Block is same as 4EFE have had....!Cast Iron....!
So I think 4AFE can handle Boost....thats clear now...with Cast Iron...It can....! About Internals.....its Risky but on Low Boost..it can be run......!!
B/w.....I am Eagerly Waiting for what i am getting....!!!
Struggle for 4AGE Begins Again 
Regards